Title: #1010: man: in sssd-ipa clarified trusted domains section
LGTM, but I will leave this to review for somebody with better English skill...
As a side note, I miss clarification where `subdomain_inherit` option should be used: in
parent domain or in sub-domain? But perhaps this should be clarified in sssd.conf...
See the full comment at https://github.com/SSSD/sssd/pull/1010#issuecomment-605869136